Self-registering try-square



(Model.) 2 Sheets-.Sheet I.

G. A. BATES. SELF REGISTERING TRY SQUARE.

No. 511,746.r

Patented Jan. 2, 1894.

(Model.) 2 Sheets-Sheet 2. G. A.. BATES.

SELF REGISTERING TRY SQUARE. No. 511,746. Patented Jan. 2, 1894.

STnTns 15 N TTB n:

GEORGE A. BATES, OF CHICAGO, ILLINOIS.

SELF=REGISTERING TRY=SQURE SPECIFICATION forming part of Letters Patent No. 511,746, dated January 2, 1894.

Application filed December 9, 1890. Serial No. 374,121. (Model.)

T0 all whom, it may concern,.-

I 3e it known that I, GEORGE A. Barns, of Chicago, in the county'of Cook and State of Illinois, late of the city and county of Hartford and State of Connecticut, have invented a new, useful, and Improved Automatic Reg'- istering-Square, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in which corresponding letters of reference in the different figures indicate like parts.

The obj ect of my invention is to so construct atry-square that it may, when placed against the object to be tested, automatically indicate or register the degree of variation in said object from the required standard-thus economizing time and insuring greater precision in Workmanship,all of which is hereinafter more particularly described and definitely pointed out in the claims.

In the drawings: Figure l, is a side View of my improved square. Fig. 2, is a vertical sectional view of the same, taken upon the line 2 2, Fig. l. Fig. 3, is a side view showing a modification of said invention. Fig. 4, is a side view showing a still further modification together with means for clamping the blade in position. Fig. 5,is a vertical sectional view of the blade and beam shown in Fig. 4f. Fig. 6, is a side view of one form of square, partly in section and partly broken away to show the clamping device in connection with the beam, and Fig. 7, is a horizontal sectional View in plan of the beam to further illustrate the blade clamping mechanism.

Referring to the drawings, A represents a right-angled frame which is constructed preferably of metal-the arm a forming the beam of the square and the arm b, the upright. The beam is slotted as shown, to receive the blade B, which is fulcrumed upon the bolt C, by which it is loosely secured to the part b. Proper clearance is made between the frame and blade to enable the latter to oscillate upon its fulcrum in the manner and for the purpose hereinafter set forth..

A multiplying indicating lever D, is fulcrumed on the upright arm b, by the bolt E.

Attached firmly to the blade B, is a stud F, Figs. 3 and 6 which projects/through an opening in the frame and engages With the short arm of the multiplying lever I). Contact between said stud and short arm is assured by means of a spring c, which may be made integral with the lever or may be attached thereto in any well known way or the stud may be attached to the frame and so arranged as to engage with the multiplying lever as shown in Figs. l and 2, in which case the spring c may be dispensed With. The oscillation of the blade is thus imparted to the multiplying lever, the long arm of which, being beveled to anedge at the upper end, rests lightly upon the surface of the graduated bar G. A line upon the end of said lever, in connection with a suitable graduated scale upon the bar as shown, permits of the perfect registration of a ninety degree angle. It is obvious that a multiplication of the movement of the blade may be caused to register upon the scale in any de- Sired ratio or proportion, such as ten to one, fifteen to one or otherwise,-the exact deflections in either direction from the center line of the scale being accurately indicated.

The graduated bar G, is preferably constructed as a movable piece as shownin Figs.

tachment or otherwise as desired; but it is manifest that the graduations may be made either upon the frame or the blade.

In order that the indicator may be secured in position upon the scale when the deflection is once determined so that a reading may be taken if desired after removing the square,I prefer to provide a suitable clamping device, J L, which is so constructed that one arm of the lever J which is fulcrumed in a mortise in the side of the beam by means of the pin 7c, is caused to rest upon the blade at d Fig. r7, While the other is in engagement With the tapered end of the screw-pin L, by the turning of Which the blade may be clamped or released at will. 4

The slight oscillating movement of the blade is inconsistent with its use as a bevel 5- it being only intended to register inaccuracies -5 and 6 and may be moved by set-screw atinwork designed to be made square. It is so constructed that the movement of the blade 1n connection with the multiplying lever will register on the scale the exact amount of de-` flection from a ninety degree angle. This variation being known, greatly facilitates the squaring of the work, which, when once effected, may be proven to be exact by the registration of the line on the lever with the center line on the graduated bar.

By means of the clamp, the movable blade may be fastened rigidly in the frame, whereupon the square is made' the equivalent of the ordinary try-square with the additional advantage that it is perfectly true, provided the blade, previous to clamping, is moved to that position where the line upon the lever and the center line of the scale are in exact registration. If, by reason of accident, so sure to destroy the accuracy of the ordinary square, the blade is moved, it may at once be returned to its true position.

When it is desirable to use my improved square in places in which it is impracticable to use the ordinary try-square by reason of the lack of light or of inability to see the point of contact, the clamp may be loosened, the square placed and irmly held against the work to be tested and the clamp tightened, when the truth or error of the work is accurately registered upon the graduated bar for inspection at leisure.

In FigsA and 5 I have shown the principle of multiplying the deflection as applied in a modified form of construction, in which one arm of the frame A, forms the beam of the square as in said previous construction. The other arm forms the upright which is narrowed at the top to serve as a stationary indicator point, and consists of a single piece, as shown at A, Fig. Lt. On the other side of said upright is fulcrumed the blade B by the bolt C, the beam being slotted to receive the lower end of the blade. The deflection of the blade is here registered between the graduations on the blade and the mark on the frame,-the ratio of multiplication being less than that shown in Fig. 1.

In Fig. 6 is represented the same general design of frame as shown in Fig. 3.

The multiplying lever shown in Fig. l differs from that shown in Fig. 3, in that it is fulcrumed upon a stud attached to the blade and oscillates with it. The short arm of the lever engages with a stud secured in the side of the frame; which serves to impart to the long arm a motion in a direction contrary to that taken by the blade which increases the multiplication upon the register.

It will be observed that the basis of the leading novel feature of my invention .and one which distinguishes it in principle from that of a bevel or a combined square and bevel, lies in the fact that both the blade and multiplying indicator, are levers with respect to their action upon each other; one having by preference, a longer fulcrum than its comanion, in that they are pivoted at relatively different points. In the'preferable construction they are shown as being both pivoted to an upright or part of the frame at right angles or substantially so, to the beam and connected with each other at still another point at a less distance from the pivotal point of the indicator than from that of the blade, "so

that a slight movement of the blade will cause a proportionately greater movement of the indicating lever. The direction in which the outer end of the blade and the corresponding free endoftheindicatorwould movewith reference to each other, would depend upon the position of the pivotal points and the point of connection between the blade and indicator by which the movement of the one is communicated to the other. If placed as shown in Fig. 3, they would move in the same direction, while, if located and connected, as shown in Fig. 1, in which the indicator is pivoted to the blade, they would move in opposite directions; but the relative extent of movement in each case would depend upon the respective relative positions of the fulcrums to that of said connecting-point between the blade and indicating leve u Having thus described my invention, I claim- 1. A self registering square, consisting of a beam and independently pivoted levers connected therewith and with each other, one of said levers forming the blade of the square,

^ and the other an indicator,-the pivotal bearing points of said levers being so located with respect to each other that the movement of the one will cause a proportionately greater movement of the other, substantially as described.

2. The combination in a self registering square of a beam, independently pivoted levers connected therewith and with each other,

one of said levers forming the blade of the square and the other an indicator, and a scale in operative connection with said indicator for indicating the angle which the working face of the blade may bear to that of the beam substantially as described.

3. The combination in a self registering square of a beam, a pivoted blade, a pivoted multiplying indicating lever `arranged to be actuated by the movement of said blade, a graduated scale and a clamping device for clamping said blade in any one of its varying positions, substantially as described.

4. A self registering square consisting of an elbow shaped frame one part of which forms a beam and the other a supporting arm for the blade, a pivoted blade, a pivoted indicating lever, onel having a longer fulcrum than the other, means for connecting said blade and lever whereby the movement of the former mayI serve to actuate the latter and a scale in operative proximity to said indicator for indicating the extent of deflection of the blade, substantially as specified.

5. In a self registering square, the combi- IOO nation of a. frame, an oscillating blade, a This specification signed and witnessed this graduated scale, an oscillating multiplying 29th day of November, 1890. lever and means for operatively connecting the same with said blade whereby the move- GEO' A' BATES' 5 ment of the former will be multiplied by the Witnesses:

latter and indicated in the desired ratio upon CHAS. E. DAVIS, the scale, substantially as set forth. C. L. GROHMANN. 

